z^-1/z^-2

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Solution for z^-1/z^-2 equation: 


D( z )

z^-2 = 0

z = 0

z^-2 = 0

z^-2 = 0

1*z^-2 = 0 // : 1

z^-2 = 0

z należy do O

z = 0

z = 0

z in (-oo:0) U (0:+oo)

(z^-1)/(z^-2) = 0

z = 0

z in { 0} 

z belongs to the empty set

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